MN418 Sample ID MN418 • Cabinet F Elbaite Tourmaline 4.787cm W x 3.7cm H x 3.91cm D • 82g Sample TypeMineralColorBrown Black Green Purple Oil SlickLusterSilky StreakWhiteCleavage/FractureIndistinct/UnevenSpecific Gravity2.56 Geographic Location/DateNA Mohs Hardness 7 Small chunk of tourmaline. Oil slick colors with thick purple on the bottom and reddish orange rock remnants on the top. Very shiny sides that almost look translucent. Description of Mohs scale here